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Journal of Porous Media
Facteur d'impact: 1.49 Facteur d'impact sur 5 ans: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

Volumes:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019029040
pages 387-394

SIMPLE FORMULAS FOR POROSITY AND SPECIFIC SURFACE OF THE CHERRY-PIT MODEL

D. Stoyan
Institute of Stochastics, TU Bergakademie Freiberg, D-09596 Freiberg, Germany
H. Hermann
Institute for Solid State and Materials Research, IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
Antje Elsner
Sächsische Landesbibliothek – Staats- und Universitätsbibliothek Dresden (SLUB), D-01054 Dresden, Germany

RÉSUMÉ

The cherry-pit or penetrable concentric-shell model is an important, very successful stochastic model for random porous media with open pores. It is based on a random system of hard spheres (the "pits"), which are dilated in order to get open pores. The exact determination of porosity φ and specific surface s is a problem obviously too difficult for contemporary mathematics. In the 1980s approximations were found which are presented in the book by Torquato (Random Heterogeneous Materials: Microstructure and Macroscopic Properties, New York: Springer-Verlag, 2002). Since 2009 these formulas have been refined by the authors through a combination of simulation and ideas of stochastic geometry. This includes the study of the polydispersed case of pits with random radii, which was mastered by means of correction factors. In the present paper the true nature of these factors is explained, which leads to simple and elegant formulas in which only the first three moments of the radius distribution appear.

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